Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
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O.k. I'm new to this site and I was hoping that I could get some feed back from all the people here. I'm currently building a 420 cid sbc for my 89 IROC-Z and the thing is I want it to look as stock as possible. I like the look of the factory TPI and was hoping that maybe with SLP runners that are fully siamesed and a good base manifold that I could have an engine that'll run realy strong on the street and still look near stock. I think that the LTR TPI set up will choke the engine to much so the other option is a HSR and I just wanted to know what every one elses opinion is. Thanks alot guys!
Forget the looks of a TPI if you wanty to feed the beast. You'l have to consider aftermarket intakes...you have a lot of cubes to work with, and the stock looking setups will just choke ya out.
Yeah you don't want tpi, that will kill all the potential of your cubes. If i were you i would seriously consider converting to carburetor. Your not gonna make any power at all with something that looks stock.
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3000lbs
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yeah I thought that the TPI would choke the motor quite a bit, I want to try and keep my power band around 5500 rpm for a good street motor. Money isn't really a concern, so I was thinking of going with the SR, but I think if I went with a HSR on that big of a motor that I could pull of 6000 rpm at my hp peak. The motor will sit in front of a 700r4 and I want to try to keep the power band around were the transmission will operate. I've seen the LPE 420's dyno numbers with the SR and both of the motors are near ideal for what I want.
no, what I meant about having a automatic, is that the auto when in drive shifts right around 5000 rpm at WOT and 4700 rpm under normal exceleration. I want the power band of the motor to match where the trany likes to shift.
Originally posted by Idle_wild no, what I meant about having a automatic, is that the auto when in drive shifts right around 5000 rpm at WOT and 4700 rpm under normal exceleration. I want the power band of the motor to match where the trany likes to shift.
Don't do that. Build the tranny around the engine. All you have to do is change the weights around to get it where you want.
Yes, TPI would be a mistake to put on something that big IMO. It just can't feed that many inches. TPI shouldn't have even been used on the 350 I think, because even on that its pretty restrictive.
On the plus side though, you'd make enough torque with a 420 TPI setup to pull your house outta the ground
