need more hp for my 74
Thread Starter
Intermediate
Joined: May 2002
Posts: 44
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From: Dripping Springs Tx
need more hp for my 74
I have a stock 74 L-48 and I am looking to increase the horsepower to around 300 can anyone suggest what might be a good setup for this any help would be great thanks Travis
Drifting
Joined: Nov 2000
Posts: 1,428
Likes: 0
Re: need more hp for my 74 (TRAVIS74)
Yeah, just see my signature......Still running stock 882 heads and it DD's at 300 (well, almost anyway!) HP. Much more driver grinability with this motor over stock....prob. can hit 325-350 w/the right heads, but for right now, I LIKE it as it is....... :cheers: :cheers: :cheers:
Safety Car
Joined: Jun 2002
Posts: 4,844
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From: Pearland TX
St. Jude Contributor
Re: need more hp for my 74 (TRAVIS74)
Travis...
I gotta admit that GM shortchanged us with horsepower on the 74's on out. Look at your console plate... they even left it off there as they had to be embarassed with 190 hp. :sleep:
The only real way that I know of obtaining the horsepower with integrity is to pull the intake, heads & cam. From there you can do just about anything. It's nothing to get to 300HP if you have a few bucks and some time. Punch out the pistons & go to 9:1 or 9.5:1... a mild cam... and a definite to go to double valve springs with dampers. The valve train is the most important thing.
I gotta admit that GM shortchanged us with horsepower on the 74's on out. Look at your console plate... they even left it off there as they had to be embarassed with 190 hp. :sleep:
The only real way that I know of obtaining the horsepower with integrity is to pull the intake, heads & cam. From there you can do just about anything. It's nothing to get to 300HP if you have a few bucks and some time. Punch out the pistons & go to 9:1 or 9.5:1... a mild cam... and a definite to go to double valve springs with dampers. The valve train is the most important thing.
Drifting
Joined: Feb 2002
Posts: 1,906
Likes: 0
From: Berlin
Re: need more hp for my 74 (TRAVIS74)
My plan (as of yesterday :) ) is to add AFR190 heads with a strong light valvetrain, strong springs (maybe rev kit too), etc, lifter, and weiand stealth intake. Demon carb and MSD ignition (want tach drive back) too. Desktop dyno claims ~500 hp@6500 rpm/450 ft-lb@5200 rpm on my stock L82 cam. I don't think the L48 cam has much potential, so you should ditch that. Also make sure your exhaust flows well if you want to go the high rpm route. Some people prefer low-end torque, which would need a completely different setup.
Team Owner
Joined: Jun 2001
Posts: 43,136
Likes: 155
From: Thomson Georgia
Re: need more hp for my 74 (aharte)
My plan (as of yesterday :) ) is to add AFR190 heads with a strong light valvetrain, strong springs (maybe rev kit too), etc, lifter, and weiand stealth intake. Demon carb and MSD ignition (want tach drive back) too. Desktop dyno claims ~500 hp@6500 rpm/450 ft-lb@5200 rpm on my stock L82 cam. I don't think the L48 cam has much potential, so you should ditch that. Also make sure your exhaust flows well if you want to go the high rpm route. Some people prefer low-end torque, which would need a completely different setup.
Drifting
Joined: Feb 2002
Posts: 1,906
Likes: 0
From: Berlin
Re: need more hp for my 74 (Alwyn678)
It will not be close to 500hp probably around 375 to 400
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Race Director
Joined: Mar 2001
Posts: 11,322
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From: Living in the Hartland
Re: need more hp for my 74 (aharte)
To make 500 horse at the fly wheel, which is gross hp, you will have to build a very high comp eng that runs 6000+ rpm's. The 375-400 horse Alwyn states is pretty resonable and is about what I am producing.
