Torque?
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Torque?
Guys is the truck EFI upper and lower intake made for torque or high rpm horsepower? I ask this because I feel that I lost a little low end torque after upgrading my upper and lower intakes to a GT40 explorer style... Why did the truck feel torquier before the upgrades such as the better upgrades like the GT40 iron heads with 1.7 roller rockers, 302HO camshaft advanced 4* and the upper and lower GT40 style???
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From: Redmond, WA
Originally Posted by Jrock909
Guys is the truck EFI upper and lower intake made for torque or high rpm horsepower? I ask this because I feel that I lost a little low end torque after upgrading my upper and lower intakes to a GT40 explorer style... Why did the truck feel torquier before the upgrades such as the better upgrades like the GT40 iron heads with 1.7 roller rockers, 302HO camshaft advanced 4* and the upper and lower GT40 style???
This is off the topic, but if you went through the trouble of swapping the heads, why did you go with the stock 302HO cam?? Especially, if the low end grunt was what you were after?? You might want to rethink that cam choice and call an expert. I doubt they'd recommend the 302HO cam advanced 4* for your application.
Also, if your exhaust from the manifold downstream has not been addressed.... you could have bottlenecked the system even more. Your motor can only breathe in as well as it can exhale. Long Tubes and a free flowing 2.5" Y pipe, high flow cat and a single exit. If you want to give that intake and heads a chance to breathe
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I have heard that the short runners are good for torque and the truck intake with the long intake runners is really good for high rpm horsepower I have seen that somewhere... You are right though I definitely feel some giddyup past 3000RPMS ;-) I went with the 302HO camshaft because the lightning guys are running that cam in their 351w lightning motors only they are advancing the camshaft only 2* instead of 4*, but being that have the 302 motor 4* was recommended so that's what I did.... I am using shorty heads and 2.5 piping through a flowmaster 40 series single in dual outlet muffler so there shouldn't be any restrictions there you would think....
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I would think...the longer truck runners are better for tourqe..
the 1.7 rockers will also add a small amount of extra duration to the cam
the 302HO cam might be ok with the extra cubes from a 351W but might be to much for a little 302 when lookingh to pull a truck around.
when building tourqe bigger is not always better.
why a 302? They need gears and higher rpms to make any power....
Call Cam Research see what they say about that cam...
the 1.7 rockers will also add a small amount of extra duration to the cam
the 302HO cam might be ok with the extra cubes from a 351W but might be to much for a little 302 when lookingh to pull a truck around.
when building tourqe bigger is not always better.
why a 302? They need gears and higher rpms to make any power....
Call Cam Research see what they say about that cam...
Last edited by HemiEater; Aug 30, 2007 at 05:08 AM.
More Turbo
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You got that flipped. Long runners are going to make more lowend. The short streight ones are better for higher rpm.
Sounds like you got a good combo going, but just moved your RPM range up a bit. Maybe a good time for a gear change to take advantage of the incressed RPM range.
Sounds like you got a good combo going, but just moved your RPM range up a bit. Maybe a good time for a gear change to take advantage of the incressed RPM range.
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Joined: Oct 2006
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From: Redmond, WA
Originally Posted by Jrock909
... You are right though I definitely feel some giddyup past 3000RPMS ;-) ....
Originally Posted by Jrock909
I went with the 302HO camshaft because the lightning guys are running that cam in their 351w lightning motors ..
Originally Posted by Jrock909
I am using shorty heads and 2.5 piping through a flowmaster 40 series single in dual outlet muffler so there shouldn't be any restrictions there you would think....
Stick with a 2.5" Y pipe and a single flowmaster downstream and you'll be impressed. Sell your old shorties on craigslist!! 4.10 or better gears would help tremendously.
