253 and 308 breakpoints

[HK1837]

Guys

I'm trying to nail down 2 x changes.

Could anyone out there with a late red motor with heads off, like a ZR or ZT prefix or a later VB VT prefix please have a look at the inner valley head bolt bosses and see if they are short or long?

Also anyone with a WB or VC-VH 253 or 308 have a look and see if they have 253/308 cast on one side or both sides?

[thatotherguy]

i have an 1988 308 vt engine number and it has the long bolts (i assume you mean the 2 inner head bolts that you can see from the valley ?) my son has a 1978 253 qr engine number and it has the short ones it has 308 embossed on one side only .5 redback spiders lost their lives to get this information

[HK1837]

It can't be a 1988 VT engine number, do you mean 1978? Can you get me the engine number and the date code off the VT block?

[Nocturne]

Could anyone out there with a late red motor with heads off, like a ZR or ZT prefix or a later VB VT prefix please have a look at the inner valley head bolt bosses and see if they are short or long?

Hi HK;

sorry for the poor pic; mine is a "ZT" 2F9 & looks like it has long bosses (can't re-check; it's reasembled!)

ZT3.jpg

ZT2.jpg

[HK1837]

Definitely looks like it has long bosses. It appears that once the Bedford 253 and 308 "silver" engines were introduced at least some (or all) red engines got the long valley bosses. Sometime mid-late in 1978. The silver engines were the first of the "blue" motors.

[HQ SS]

I have pictures of a 12J8 QR block and it has the long bosses.
Engine number is QR998xxx
Cheers Paul.