1984 GMC short bed 4X4.
stock 350 qjet with th350 transmission. Trying to decide on which iron heads to swap on. Looking for torque.
That's a good looking truck. Have you considered Vortec heads from a '96-'98 Chevy? You'll need to change the intake as well. The package would be a serious improvement over the boat anchors your truck has on it from the factory. Might even consider swapping the stock exhaust manifolds with some headers for improved torque.1984 GMC short bed 4X4.
stock 350 qjet with th350 transmission. Trying to decide on which iron heads to swap on. Looking for torque.
That's a good looking truck. Have you considered Vortec heads from a '96-'98 Chevy? You'll need to change the intake as well. The package would be a serious improvement over the boat anchors your truck has on it from the factory. Might even consider swapping the stock exhaust manifolds with some headers for improved torque.
I just bought that ones Chevy twin. It is not near as nice as yours yet but lets call it a work in progress. As for the heads I can't help you there...Mine has a 454
Pretty sure it's only certain cast numbers that give problems. 906 heads are 64 chamber 1.94/1.50 valves with a 170cc intake runner. Haven't heard anybody having issues with them. I like them better than the old double humps we used to run. They are easily worth 50-70hp gain with headers and aluminum intake.I have been considering Summit Vortec heads and world products SR torquer with 58 cc chambers. Vortec heads are subject to cracking but are going to produce more torque at lower RPM which is exactly what I want. With the SR torquer I have less risk of cracking and can use the Wieand aluminum intake with Q jet I have. I just wonder what the performance difference will be. I have the factory steel tube exhaust manifolds that came on the 85 86 vin M heavy duty motor that is in the truck now. I do not plan on changing cams.
Thanks! I will look there. I am interested in hearing any real world experience with either set. To be clear, I am looking at summit brand Vortec and world products SR torquer. I am not going to use junkyard or factory productLook on youtube, a man there tells in his opinion the good and bad GM heads, pretty good info IMO..
Just curious who told you GM Vortec heads were prone to cracking. I've built several engines for 4x4 applications with them and never had a single issue. Now the Vortec heads they used on the newer LS Vortec 5.3 engines in '99 and up ARE prone to cracking...but those are a different animal than the 96-00 Vortec heads.Thanks! I will look there. I am interested in hearing any real world experience with either set. To be clear, I am looking at summit brand Vortec and world products SR torquer. I am not going to use junkyard or factory product