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Forum: General Q & A

04-05-2005, 10:49 AM

Replies: 34

90 7.4L upgrade?

Views: 4,468

Posted By tomcat

Re: 90 7.4L upgrade?

Gary: I think you're right, the 330 to 300 rating was just a change from crank to propshaft HP. But I thought that GM started using the peanut port on truck engines in that same time period, so...

Forum: General Q & A

04-05-2005, 07:44 AM

Replies: 34

90 7.4L upgrade?

Views: 4,468

Posted By tomcat

Re: 90 7.4L upgrade?

Your engine is only 300 HP. But the previous model had better heads and was called 330. That thread has good info if you switch to regular oval port heads instead of the panut port heads that you...

Forum: General Q & A

04-04-2005, 04:59 PM

Replies: 34

90 7.4L upgrade?

Views: 4,468

Posted By tomcat

Re: 90 7.4L upgrade?

WARNING: You are about to take the first step onto a slippery slope; the need for speed is a disease! I had a 1990 boat with a 7.4L so I can tell you exactly what I did and how it performed. It's...

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