Alright guys I just cant make a decision and I'm about ready to pull the trigger on an engine going with Thompson motorsport ,my goal is 500+whp daily drivable ish with ac etc in my 01 z28 6spd 4.10s , I if I cheap out and save the $900 ish and go 370ci how much power will I be missing out on compared to the 408 ? I have the fast 102 ported 243s with larger valves ,cant afford new heads so I have to run these .also TMS suggest a 238-242 113 cam which I think is small for a stroker ,but I do want it to drive nice in traffic ac on etc ,also I was told my 36lb injectors are sufficient but I also feel that they are small for 500+ hp and was told to get 42-46lb

 

Seems reasonably you could be down 30-50hp with a 370 compared to a 408 and the same in torque. That cam will drive nice in a 408.

 

The stroker will put down more torque across a larger rpm spread. The fun factor will be higher.
yes, piston speed will increase but that is a fair trade off. (Just limit rpm )

 

Contact Pat G for a cam.... thank me a later.

 

Power (HP) will be minimal between the two, Tq is where you will see the difference. You will have more usable HP/TQ with the 408. Let us know if we can help in any way. Thank you sir.

Thank you,
Kyle
972-853-2450

 

I'll be given you guys a call real soon just coming up with the last few hundred I need

 

Yup. Your HP is going to be limited by the airflow of the heads. It takes X amount of air to make X amount of HP.

 

You'd probably end up with more piston skirt wear on the 408 as the miles add up.

 

I went through this last winter, and ended up staying stock stroke. In hind sight I wish I would have spent the extra money on a crank and built a 408.

 

I'm really pleased so far with the iron 376 with just 853 heads I built for about 11.1:1 though I'm using much less cam so the tourqe is awesome at the stock cruising rpms,. That cam spec looks really big to me but I don't know anything

 

Just my opinion, but if Im spending that kinda money, I will gladly spend the extra change and go with the stroker crank.

 

I vote for the stroker. The 408ci will make your goal of 500whp easier to achieve while maintaining better drivability than 370ci.

 

No replacement for displacement!!! Go for the stroker. Torque is what makes things more fun.

 

I'd favor the 408 over the 370. With Correct part selection and assembly the 4 inch stroke motor should hold up well. There was one 4 inch crank build that held up for 170,000+ miles and lots of fun.

 

Stock stroke cranks can be had for free so if it gets hurt at some point down the road it's going to cost a lot less to repair it or at that point if you had more funds you could make it a stroker, I'm thinking you would be happy with a flat top 370-376" and your heads but I'm on a tight budget so I wouldn't splurge on a fancy crank unless the rest of the car was setup ideal for it. N/a only though and no budget to worry about (your money) I'd do as much cid as possible for a weekend car

 

408 with LS3 heads will be the better route Ive gotten 590+whp using the TMS/FED M311s before N/A (13.0:1CR)

 

Probably the best $26.25 I ever spent.

CamMotion 238/246 .633/.633 111+3 on my Gen 3 LS370 build...

 

He have to be the most knowledgeable cam guy I've spoken to....

 

Yes! Or whatever fits your budget. Maybe the 370 with your 243s will make for a good combo. The 408 may need more flow if you want to take advantage of the extra cubic inches.

 

Buy once and build once. Save up a few more hundred and do the stroker. Then start saving again to do the heads you want later.

But if you do the 370 now there is a good chance you will regret it. I doubt there will ever be a time that you go man I wish I had a 370 instead of a 408