Smitty,

Can I buy a throttle body which is ready bored and with the bigger butterflys.
You can e-mail on [email protected]

Harry

I have to find the sheet. there is a whole recipe for doing the engine. will basically be a 500efi when you are done. runs real well and dependable. don't ever let anybody tell you that you can put a bigger cam in & not remap. maybe you can but I don't think it is wise. the remap costs about $400 last time I did it.

WHo are the better names in remapping. I'm going to use a "731" cam.

cam I used was 169621.
Use Mark at Precision Marine for programming your efi. He is as good as they get. If you want to remap I would suggest a tried formula unless you want to send your engine out for dyno time & custom tuning.

That cam is very similar to my 168731

So who do i contact for a remap?What would be a good cam without having to change whole drivetrain on both engines?Exhaust Manifolds are first on my list and mirage plus 25p props.Sill dont know if Gil is much better than Emi Thunders?I can get a good deal on Emi's.

FYI...I have had my stainless marine exhaust for 6 years. Still like new.

I also like the stainless marine. I have it on my own boat & alot of others I know of. Nobody has leaks. just make sure you get longer tailpipes than the stock-like short ones for any type of high performance engine. I can also get the remap, machining, or any other parts or services for you for the upgrade.

Jim

So far Stainless Marine seems to be a favourite in this thread although from research on the internet it seems like Gil is most popular.Their runners are supposed to go all the way down the tailpipe from what i understand.I cant seem to find any info on the EMI thunders as to what they are built like on the inside.Are they just an open chamber Manifold or do they have internal runners?I hve decided to stick with stock 502 mags but im gonna get manifolds and risers this year.Next year i can still do some performance work once i get some more cash

If you buying rotating assembly you could make it a 540. You bore the block .030 over and make it a 4.500" bore with a 4.250 stroke. Use the Crane 168741 cam. I did this and used the stock fuel injection and the motor made around 600hp.