Summit vortec heads

[98k2500]

Has any one used these heads and if so what did you think of them?

Summit Racing SUM-151124 Summit Racing™ Vortec Cylinder Heads | Summit Racing

Free Shipping - Summit Racing™ Vortec Cylinder Heads with qualifying orders of $109. Shop Cylinder Heads at Summit Racing.

www.summitracing.com

The description says Springs are set up to run hydraulic flat tappet cam. Would it be OK to use a roller cam with .480 lift?

One review says comps beehive springs won't fit. Anyone know if that's true?

 

[Hipster]

I would get the springs recommended for whatever cam your going to run. Roller cam have faster ramp intensity so whatever springs come with the heads might not not have enough seat pressure/rate. .480 isn't extreme but....

 

[98k2500]

Another question from the noob.I chatted with a Summit rep. The description for these heads says max lift .520 with the springs that come with it. Comps 981-16. In the QAnd A section it says .520 max lift with hydraulic flat tappet.

I asked if the max lift for a hydraulic roller would be the same. The rep said I would need to use different springs and that ..

" Flat tappet and roller springs are totally different and should not be interchanged, used on one or the other"

This dodnt make sense to me so thought I'd see what you all have to say.

 

[1998_K1500_Sub]

" Flat tappet and roller springs are totally different and should not be interchanged, used on one or the other"

This dodnt make sense to me so thought I'd see what you all have to say.

Looks like at least one answer is in the post just prior! Quoting...

I would get the springs recommended for whatever cam your going to run. Roller cam have faster ramp intensity so whatever springs come with the heads might not not have enough seat pressure/rate. .480 isn't extreme but....

 

[Caman96]

Has any one used these heads and if so what did you think of them?

Summit Racing SUM-151124 Summit Racing™ Vortec Cylinder Heads | Summit Racing

Free Shipping - Summit Racing™ Vortec Cylinder Heads with qualifying orders of $109. Shop Cylinder Heads at Summit Racing.

www.summitracing.com

The description says Springs are set up to run hydraulic flat tappet cam. Would it be OK to use a roller cam with .480 lift?

One review says comps beehive springs won't fit. Anyone know if that's true?

Aren’t those the heads PlayingWithTBI has?

 

[PlayingWithTBI]

Aren’t those the heads PlayingWithTBI has?

No, I have the Summit Racing aluminum heads made for the TBI intake bolt pattern, 2.02"/1.60" valves, 62cc chamber for better compression, angled plugs, yada yada yada. Plus they flow better than the Vortec heads,

Summit Racing SUM-162108 Summit Racing™ 62cc Aluminum Cylinder Heads for Small Chevy | Summit Racing

Free Shipping - Summit Racing™ 62cc Aluminum Cylinder Heads for Small Chevy with qualifying orders of $109. Shop Cylinder Heads at Summit Racing.

www.summitracing.com

 

[Caman96]

No, I have the Summit Racing aluminum heads made for the TBI intake bolt pattern, 2.02"/1.60" valves, 62cc chamber for better compression, angled plugs, yada yada yada. Plus they flow better than the Vortec heads,

Summit Racing SUM-162108 Summit Racing™ 62cc Aluminum Cylinder Heads for Small Chevy | Summit Racing

Free Shipping - Summit Racing™ 62cc Aluminum Cylinder Heads for Small Chevy with qualifying orders of $109. Shop Cylinder Heads at Summit Racing.

www.summitracing.com

 

[PlayingWithTBI]

This dodnt make sense to me so thought I'd see what you all have to say.

FWIU roller cams have a more aggressive ramp up and down than the flat tappet ones so, you need a different spring rate. Like suggested, talk to your favorite cam company rep and go with that.

 

[Hipster]

Another question from the noob.I chatted with a Summit rep. The description for these heads says max lift .520 with the springs that come with it. Comps 981-16. In the QAnd A section it says .520 max lift with hydraulic flat tappet.

I asked if the max lift for a hydraulic roller would be the same. The rep said I would need to use different springs and that ..

" Flat tappet and roller springs are totally different and should not be interchanged, used on one or the other"

This dodnt make sense to me so thought I'd see what you all have to say.

The total lift/clearance number is only one aspect of a valve spring. You also have seat pressure, open pressure, and spring rates to deal with. There are differences in spring quality and I don't expect high end springs and retainers installed on a budget head. Get the right one for the cam you are going to be running. Roller cams need faster rates than hydraulics.

 

[98k2500]

I thinking of going with this cam. I called Lunati and they said the comp cams 981-16 springs will work fine with it.

You must be registered for see images attach