I would advise finding a standard TH350, the TH350C won`t last long before the power grenades the converter, Been there, Seen that.

 

Sounds like it should have some pretty good torque from the ground up (low end). We don't use any cast cranks at our shop but we have balanced a lot of them for other engine builders in the area and we have found quite a few of them off from end to end.

 

It looks pretty good, but I would be a little concerned about the compression. 10.4:1 seems a little high for pump gas with iron heads.

Adam

 

It looks pretty good, but I would be a little concerned about the compression. 10.4:1 seems a little high for pump gas with iron heads.

Adam

The Vortec heads do not require as much timing as the some other iron heads as we have some 11:01 - 383 compression engines running on the street with no problems.

Do you know Mark Burch in Lincoln

 

That is interesting about the vortec heads. I would be interested in seeing how a 10:1 motor with more timing would perform compared to the 11:1 motor with less timing. Have you compared a situation like that? As far as Mark Burch goes, I am not familar wtih that name. Is he involved in cars somway that I might know him from.

Adam

 

That is interesting about the vortec heads. I would be interested in seeing how a 10:1 motor with more timing would perform compared to the 11:1 motor with less timing. Have you compared a situation like that? As far as Mark Burch goes, I am not familar wtih that name. Is he involved in cars somway that I might know him from.

Adam

Any of the engines we have had on the dyno using Vortec heads and the compression being 10:01 up to 11:01 we see timing being from 29 to 32 degrees of total timing and the engines with 5.7 rods run a little more timing due to the piston being at TDC for a shorter period of time.

Any time we have tried more timing on these engines it always kills the torque and horse power from what we have seen as far as burn on the pistons after a year of running we see a complete burn on the tops of the pistons as well. And being a fast burn head would require less timing do to the faster burn. And we have found over theyears that a good pefromance valve job plays a big roll in timing as well and when the head is more efficiant it will require less timing.

One other area that we have found is good ring seal seems to require less timing as well.

Mark owns an accouting firm and owns some of the top sprint cars in his area or where ever they run as his car was the top car in Florida last Feb. during speed weeks as we have been preparing his blocks for him for a number of years now.

 

I have an engine builder helping me with this engine build . When I get started he will let me know what gasket to use to detonate control this thing. The cam cutter at ultradyne told me my compression will be around 10: 1 with this camshaft.

 

Sounds like it should have some pretty good torque from the ground up (low end). We don't use any cast cranks at our shop but we have balanced a lot of them for other engine builders in the area and we have found quite a few of them off from end to end.

Will it be a good thing to have the crankshaft balanced.

 

Will it be a good thing to have the crankshaft balanced.

It would be a plus to balance as you are using forged pistons which are heavier the stock pistons which will make the crank under balanced which is not a good thing.

If they don't have to add weight it should run around 150 dollars

 

It would be a plus to balance as you are using forged pistons which are heavier the stock pistons which will make the crank under balanced which is not a good thing.

If they don't have to add weight it should run around 150 dollars

Thanks for the advice, I will take it to the shop Monday on my way to give a couple a price on a job. How do you check the deck height on the block . does the crank has to be in it. Thank in advance BLUE82

 

Don´t worry about the CR. I´ve driven a 10,60:1 engine with GM 492 heads 4 years with a lot of racing on pump gas only. No problemo. Even with a 114deg LSA on the cam.

 

Don´t worry about the CR. I´ve driven a 10,60:1 engine with GM 492 heads 4 years with a lot of racing on pump gas only. No problemo. Even with a 114deg LSA on the cam.

On the hydraulic cams we use on the street we use a 108 to 110 lobe sep which will build more cylider pressure then one at 114 lobe sep. and we have never have had any issues with any of the engines we have built on pump gas.

 

Thanks for the advice, I will take it to the shop Monday on my way to give a couple a price on a job. How do you check the deck height on the block . does the crank has to be in it. Thank in advance BLUE82

If your dealing with a good machine shop you should be able to take half your stroke add your rod lenth and add your compression height of your pistons as this should calculate out to the number for zero deck.

This is the way we have done it for the last 33 years and no problems

 

Is compression distance the same as compression height.

 

Is compression distance the same as compression height.

Yes !!!!!!!!!!!!!!!!!

 

It would be a plus to balance as you are using forged pistons which are heavier the stock pistons which will make the crank under balanced which is not a good thing.

If they don't have to add weight it should run around 150 dollars

When I go to the shop what parts do I have to bring.

 

When I go to the shop what parts will I have to bring for the balancing.

 

When I go to the shop what parts will I have to bring for the balancing.

Crank, rods, wrist pins, pistons, locks if needed, rings, rod bearing, spacer ring if there is one, That should cover it.

If externally balanced you will need the balancer and flywheel.

 

Thanks, CNC BLOCKS N/E I have everything packed and ready to go. The machine shop I deal with is only 15 mi from where I live.

 

Send crank pulley, damper and flywheel as well.

 

cylinder head question

Will vortec cylinder heads with 170 runners 64cc 1.94 /1.50 valves make same horsepower as 170runners 64cc 2.02/1.60.

 

Will vortec cylinder heads with 170 runners 64cc 1.94 /1.50 valves make same horsepower as 170runners 64cc 2.02/1.60.

Going bigger then a 2.000 intake valve on a Vortec head will hurt them as far as flow ans power as we have even seen this on the new Vortec Bowtie heads.

I know a shop that just build an (circle track) engine with the now Vortec Bowtie heads and used 2.055 intale vaves and this killed the engine.

And going to a 2.020 in the Vortec heads will weaken the bowl area and are more likely to crack accross the deck as this area of the head is thin to start with.

 

Pocket port

Would It be alright to pocket port and polish the 170s