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Search: Posts Made By: jw454
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Forum: Do It Yourself, Boating on a Budget
11-06-2008, 06:24 PM
Replies: 6
Views: 2,927
Posted By jw454

The heads and comp ratio on the 300-330HP are...

The heads and comp ratio on the 300-330HP are not going to make anywhere near 500HP and unless you switch to a large oval port with 2.19-1.88 valves, good bowl blend, some port work, at least 9.5:1...
Forum: Do It Yourself, Boating on a Budget
11-06-2008, 06:13 PM
Replies: 36
Views: 11,712
Posted By jw454

I have been building Chevys for both high...

I have been building Chevys for both high performance auto and marine for years, particularly the BBC. All the intake and camshaft upgrades wont do you a bit of good without aquiring a true high...
Forum: Do It Yourself, Boating on a Budget
11-04-2008, 08:44 PM
Replies: 10
Views: 3,672
Posted By jw454

Last cylinder on port bank is #7. Probably had...

Last cylinder on port bank is #7. Probably had crossfire from the #5 plug wire, causing severe preignition. Make shure your wires are loomed so that #'s 5-7 and 4-8 on the other bank cant touch each...
Forum: Do It Yourself, Boating on a Budget
11-04-2008, 08:36 PM
Replies: 9
Views: 1,917
Posted By jw454

I think 1989 had Thunderbolt IV ign. There is no...

I think 1989 had Thunderbolt IV ign. There is no vaccum adv. Advance is controlled by a advance module located on the port side exhaust riser. If the ign. timing is jumping around under a constant...
Forum: Do It Yourself, Boating on a Budget
11-04-2008, 08:21 PM
Replies: 6
Views: 2,927
Posted By jw454

The Gen V standard duty has peanut port heads and...

The Gen V standard duty has peanut port heads and will not flow past 4000-4500 rpm. and cant possibly make power at or above that rpm range with the stock exhaust. Look for a cam in the range of...
Forum: Do It Yourself, Boating on a Budget
11-04-2008, 08:09 PM
Replies: 16
Views: 2,905
Posted By jw454

Summit or Jegs always have the best price.

Summit or Jegs always have the best price.
Forum: Do It Yourself, Boating on a Budget
11-04-2008, 08:05 PM
Replies: 50
Views: 134,774
Posted By jw454

10 psi. per 1000 rpm is a proven fact and pushing...

10 psi. per 1000 rpm is a proven fact and pushing more oil pressure than that is just wasting horsepower and promoting spark scatter. A 330 hp. 454 has a standard volume oil pump, which is what it...
Showing results 1 to 7 of 7


 
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