|
more hp
was going to bolt on a blower but it will not fit under hatch so time to get more hp from motor
454 420 would like to get 525 out of it is it worth building a new motor if so what should i do to it or am i better off buying a motor already buildt and selling off the motor i have what should it cost to build my motor? HAPPY HOLIDAYS TO ALL |
look into methanol injection ive tried it had great results,,ho ho ho
|
Methonal injection isnt going to do much without a supercharger.
You can make some decent power out of your engine. Depending on the hours, if low enough, you can keep your shortblock assembly and leave it be. The internals are plenty stout for 525HP. Cylinder heads. A good set of aftermarket heads, will work better than the stock 420 heads. The GM heads you have can be improved, but by the time your done rebuilding, porting, etc, your almost at a new set of heads, that are NEW castings. Many of those old GM heads were known to drop seats, crack, etc. Something like a pair of Dart Iron eagle 308's are nice for the cost. If you want to spend a little more, something like the AFR 290, or 305 aluminum, or Dart Pro 1 310. Camshaft. You'll need a decently agressive roller cam setup. Something in the 232/242, 236/245 duration range, with a 112LSA. You'll need to turn the engine faster than say 5000-5200 to see gains. with the right cam, lifters, springs, pushrods, etc, 5500-5800 isnt a problem. Your intake manifold, if the original single plane, will work fine, and so will the stock 800 Holley carb. If your engines have some time on them, and the shortblocks need to be gone thru, and a bore is needed, you may want to go with a larger domed piston to get the compression up from the 8.75 range, to around 9.5. Or you can always stroke it to a 489-496ci. 575-600HP is doable with a 496. lots of ways to do it. All depends on your budget. I personally dont like buying "used" engines. Too many horror stories. Would rather build my own and know what i have. |
Originally Posted by mild thunder
(Post 3837715)
methonal injection isnt going to do much without a supercharger.
You can make some decent power out of your engine. Depending on the hours, if low enough, you can keep your shortblock assembly and leave it be. The internals are plenty stout for 525hp. Cylinder heads. A good set of aftermarket heads, will work better than the stock 420 heads. The gm heads you have can be improved, but by the time your done rebuilding, porting, etc, your almost at a new set of heads, that are new castings. Many of those old gm heads were known to drop seats, crack, etc. Something like a pair of dart iron eagle 308's are nice for the cost. If you want to spend a little more, something like the afr 290, or 305 aluminum, or dart pro 1 310. Camshaft. You'll need a decently agressive roller cam setup. Something in the 232/242, 236/245 duration range, with a 112lsa. You'll need to turn the engine faster than say 5000-5200 to see gains. With the right cam, lifters, springs, pushrods, etc, 5500-5800 isnt a problem. Your intake manifold, if the original single plane, will work fine, and so will the stock 800 holley carb. If your engines have some time on them, and the shortblocks need to be gone thru, and a bore is needed, you may want to go with a larger domed piston to get the compression up from the 8.75 range, to around 9.5. Or you can always stroke it to a 489-496ci. 575-600hp is doable with a 496. Lots of ways to do it. All depends on your budget. I personally dont like buying "used" engines. Too many horror stories. Would rather build my own and know what i have. |
Originally Posted by cig20
(Post 3837721)
your in chicago im in so.wisconsin can you refer a good engine builder
Russ at LAM in kenosha does nice work. Opel engineering in Streamwood, Il is good. Bill Lawson at ATECO engines in Waukegan. Those guys are all familiar with Marine. |
Lake geneva
who is your first pick or where do you go MOTOR HAS ABOUT 500 HRS |
Originally Posted by MILD THUNDER
(Post 3837715)
Methonal injection isnt going to do much without a supercharger.
You can make some decent power out of your engine. Depending on the hours, if low enough, you can keep your shortblock assembly and leave it be. The internals are plenty stout for 525HP. Cylinder heads. A good set of aftermarket heads, will work better than the stock 420 heads. The GM heads you have can be improved, but by the time your done rebuilding, porting, etc, your almost at a new set of heads, that are NEW castings. Many of those old GM heads were known to drop seats, crack, etc. Something like a pair of Dart Iron eagle 308's are nice for the cost. If you want to spend a little more, something like the AFR 290, or 305 aluminum, or Dart Pro 1 310. Camshaft. You'll need a decently agressive roller cam setup. Something in the 232/242, 236/245 duration range, with a 112LSA. You'll need to turn the engine faster than say 5000-5200 to see gains. with the right cam, lifters, springs, pushrods, etc, 5500-5800 isnt a problem. Your intake manifold, if the original single plane, will work fine, and so will the stock 800 Holley carb. If your engines have some time on them, and the shortblocks need to be gone thru, and a bore is needed, you may want to go with a larger domed piston to get the compression up from the 8.75 range, to around 9.5. Or you can always stroke it to a 489-496ci. 575-600HP is doable with a 496. lots of ways to do it. All depends on your budget. I personally dont like buying "used" engines. Too many horror stories. Would rather build my own and know what i have. Sorry for the sidetrack but need to give credit where credit is due! Merry Christmas! Thanks Jim |
Originally Posted by 502ss
(Post 3837796)
joe - thats a quality post right there! It's a real shame that there are not more people on here that can provide valuable feedback like this with out flaming the op or providing totally off topic and helpless information!
Sorry for the sidetrack but need to give credit where credit is due! Merry christmas! Thanks jim |
Thanks guys. Merry christmas to you guys and your families.
Cig20, I'd rather not post online who I like or think is better. I have dealt with both LAM, and ateco, and both had good finished products. Several friends of mine dealt with Ted at Opel , and were very pleased. I choose to assemble my own stuff nowadays, and pay for machine work. Mainly because I enjoy Doing it |
Thanks guys. Merry christmas to you guys and your families.
Cig20, I'd rather not post online who I like or think is better. I have dealt with both LAM, and ateco, and both had good finished products. Several friends of mine dealt with Ted at Opel , and were very pleased. I choose to assemble my own stuff nowadays, and pay for machine work. Mainly because I enjoy Doing it |
| All times are GMT -5. The time now is 03:43 PM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.